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playground:alphatross
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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playground:alphatross [2022/01/31 11:53] leblanc Reformat, rewrite, and clarify. |
playground:alphatross [2022/06/08 09:05] (current) leblanc Same as last revision, which didn't have any changes. |
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| == In the Control Room == | == In the Control Room == | ||
| - | - Source camera must have a view of the faraday screen on the blue box of the source head. | + | - Source camera must have a view of the Faraday screen on the blue box of the source head. |
| - To gain control of the source camera: On the joystick unit press "2" then "CAM" to specify the camera. | - To gain control of the source camera: On the joystick unit press "2" then "CAM" to specify the camera. | ||
| - | - Use the joystick and "TELE" or "WIDE" to create a view of interest. | + | - Use the joystick and "TELE" or "WIDE" to create a view of interest. Pressing "6" followed by "Call" will move and zoom the camera appropriately. |
| - If not already present, launch the Alphatross software (Version 6.0) on the source computer. | - If not already present, launch the Alphatross software (Version 6.0) on the source computer. | ||
| - Press the "on" button for Water Cooling. The water cooling system: | - Press the "on" button for Water Cooling. The water cooling system: | ||
| Line 39: | Line 39: | ||
| - it should remain less than 4 x 10-6 Torr. | - it should remain less than 4 x 10-6 Torr. | ||
| - Operating range is around 2 x 10-6 or less. | - Operating range is around 2 x 10-6 or less. | ||
| - | - Raise the Probe Voltage to 3 kV | + | - Raise the Probe Voltage to 3 kV. |
| - Check probe current to insure that it is less than 4 mA. | - Check probe current to insure that it is less than 4 mA. | ||
| - | - Continue raising the probe voltage to 6kV | + | - Continue raising the probe voltage to 6kV. |
| - Maintain probe current less than 4mA. High probe current may indicate: | - Maintain probe current less than 4mA. High probe current may indicate: | ||
| - Source is still grounded. | - Source is still grounded. | ||
| - Source is dirty and requires service. | - Source is dirty and requires service. | ||
| - | - Set Extractor Voltage to 5kV. | ||
| - | - Set Bias Voltage to a value that gives desired injection energy. Typical values are at least 53keV. | ||
| - | - Injection energy is displayed in the upper window. | ||
| - | - Injection energy is the sum of Probe, Extractor, and Bias voltages. | ||
| - | - Beam yields improve above 30 keV. | ||
| - | - Set the Focus Voltage to 5.5 kV | ||
| - | - Set the Faraday cup meter to position 7 (alphatross cup). | ||
| - | - Tune for maximum __stable__ beam. | ||
| - | - Primary adjustment at this stage seems to be focus voltage. | ||
| - | - Current may be on the order of 30 μA. | ||
| - | |||
| - | ==**DO NOT PROCEED UNTIL CHAMBER TEMPERATURE EXCEEDS 39°C**== | ||
| - | |||
| - Set the Oven Voltage to 80 V. | - Set the Oven Voltage to 80 V. | ||
| + | - Set Extractor Voltage to 5kV. | ||
| + | - Set Bias Voltage to a value that gives desired injection energy. Typical values are at least 53keV. | ||
| + | - Injection energy is displayed in the upper window. | ||
| + | - Injection energy is the sum of Probe, Extractor, and Bias voltages. | ||
| + | - Beam yields improve above 30 keV. | ||
| + | - Set the Focus Voltage to 5.5 kV | ||
| + | - Set the Faraday cup meter to position 7 (Alphatross cup). | ||
| + | - Tune for maximum __stable__ beam. | ||
| + | - Primary adjustment at this stage seems to be focus voltage. | ||
| + | - Current may be on the order of 30 μA. | ||
| - Set Einzel Lens to 20 kV. | - Set Einzel Lens to 20 kV. | ||
| - Wait until the Oven Temperature is at least 160 C, 10 - 20 minutes. | - Wait until the Oven Temperature is at least 160 C, 10 - 20 minutes. | ||
| Line 77: | Line 74: | ||
| - Click the software button "Automatic Shutdown" | - Click the software button "Automatic Shutdown" | ||
| - | - Confirm you wish to quit be answering "y" | + | - Confirm you wish to quit by answering "y" |
| - Walk away. | - Walk away. | ||
| - ** Do not open the source gates until the process is finished ** | - ** Do not open the source gates until the process is finished ** | ||
playground/alphatross.1643647990.txt.gz · Last modified: 2022/01/31 11:53 by leblanc
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